<template>
    <el-container class="home-container">
      <!-- 头部区域 -->
      <el-header>
        <div>
          <img src="../assets/tortoise.jpg" alt="头像">
          <span>网上学习管理系统</span>
        </div>
        <el-button type="info" @click="logout">退出</el-button>
      </el-header>
      <!-- 页面主体区域 -->
      <el-container>
        <!-- 侧边栏 -->
        <el-aside :width="isCollapse ? '64px' : '200px'">
          <div class="toggle-button" @click="toggleCollapse"><el-icon size="20px"><Operation /></el-icon></div>
          <!-- 侧边栏菜单区域 -->
          <el-menu  mode="vertical" menu-trigger="click" background-color="#333744" 
          text-color="#fff" active-text-color="#409EFF" unique-opened :collapse="isCollapse"
           :collapse-transition="false"  :default-active="activePath" router>
            <el-sub-menu :index="item.id + ''" v-for="item in menulist" :key="item.id">
              
                <template #title>
       
                <span>{{item.menu_name}}</span>
                </template>
                
                    <el-menu-item :index="'/' + menus.menu_path"  v-for="menus in item.menusList" :key="menus.id" @click="saveNavState('/' + menus.menu_path)"  >{{menus.menu_name}}</el-menu-item>
             
            </el-sub-menu>
           
          </el-menu>
          
        </el-aside>
        <!-- 右侧内容主体 -->
        <el-main>
          <!-- 路由占位符 -->
          <router-view></router-view>
        </el-main>
      </el-container>
    </el-container>
  </template>
  
  <script>
  export default {
    data() {
      return {
        // 左侧菜单数据
        menulist: [],
        // 是否折叠
        isCollapse: false,
        // 被激活的链接地址
        activePath: ''
      }
    },
    created() {
      this.getMenuList()
      this.activePath = window.sessionStorage.getItem('activePath')
    },
    methods: {
      logout() {
        window.sessionStorage.clear()
        this.$router.push('/login')
      },
      // 获取所有的菜单
      async getMenuList() {
        const { data: res } = await this.$http.get('menusList/'+window.sessionStorage.getItem('token'))
        if (res === null) return this.$message.error("数据库崩溃啦")
        this.menulist = res
        this.menulist.forEach(x =>{
            console.log(x.menu_name)
        })
       
      },
      // 点击按钮，切换菜单的折叠与展开
      toggleCollapse() {
        this.isCollapse = !this.isCollapse
      },
      // 保存链接的激活状态
      saveNavState(activePath) {
        console.log(activePath)
        window.sessionStorage.setItem('activePath', activePath)
        this.activePath = activePath
      }
    }
  }
  </script>
  
  <style lang="less" scoped>
  .home-container {
    height: 100%;
  }
  .el-header {
    background-color: #373d41;
    display: flex;
    justify-content: space-between;
    padding-left: 0;
    align-items: center;
    color: #fff;
    font-size: 20px;
    > div {
      display: flex;
      align-items: center;
      span {
        margin-left: 15px;
      }
    }
  }
  
  .el-aside {
    background-color: #333744;
    .el-menu {
      border-right: none;
    }
  }
  
  .el-main {
    background-color: #eaedf1;
  }
  
  .iconfont {
    margin-right: 10px;
  }
  
  .toggle-button {
    background-color: #4a5064;
    font-size: 10px;
    line-height: 24px;
    color: #fff;
    text-align: center;
    letter-spacing: 0.2em;
    cursor: pointer;
  }
  img{
    width: 60px;
    height: 40px;
    border-radius: 50%;
  }
  </style>
  